[jQuery] [autocomplete]Error: $("#suggest1").autocomplete is not a function

[jQuery] [autocomplete]Error: $("#suggest1").autocomplete is not a function


<script type="text/javascript">
$().ready(function() {
var data = [ {QUERY: $("#QUERY").val(), url:'test.asp?
Process=CheckCustomer'} ];
$("#suggest1").autocomplete(data);
});
</script>
<div class="required">
<label for="Test...">Test...</label>
<input type="text" id="suggest1" />
        </div>
Data needs to be taken as:
test.asp?Process=CheckCustomer&QUERY=a
Not very familiary with jquery yet. Can anyone tell me why I get the
following error.
Error: $("#suggest1").autocomplete is not a function
Source File: http://www.refinethetaste.com/html/cp/default.asp?Section=orders&Process=AddOrder
Line: 162